Diablo® III

Steps:
1. At the login screen, click 'Options'
2. Goto Account and change your region to 'Europe'
3. Apply/Accept
4. Log in
5. Back out
6. Change your region back to 'The Americas'
7. Login
8. ...
9. Profit.

[note: I tested it to work for me, though some have reported that it doesn't for them. Give it a try - cheers!]

UPDATE:

The following was posted deep in another thread, and may help to fix it:

Takes a connection reset to fix. On windows you can open command prompt and reset your connection using

ipconfig /renew

Sometimes that might not be enough, so you might want to do

ipconfig /release
ipconfig /renew

no luck for me

Worked for me - thanks!

Omg it actually works....wth.?

Worked for me, thanks! :)

my first post in the entire forum. I just logged in to say you thanks! It really works!!

Worked for me.

yes i did it too and worked... i came back to forums to see if the 3006 still remains.. this means i wont be logging out to see if AH is back up lol

tried it a second time and it worked WOW! thanks!

not working for me either.

Almost worked for me. Got into the Euro server just fine, but when I switched it back to Americas, I got stuck at Hero List. It did pass through the other two a lot quicker, though.

That actually worked for me.

wow it works...

That's a negatory.

somehow it worked

This worked, thank you!!

Hooked on F-honics worked for me.

So did this. Thanks!

Didn't work for me, tried it 4 times

hot dog

did this earlier and it failed. actually did it many times without success.

just tried it again and I'm up.
Let's see if it lats ;)